Question

a car travels 84 km/ hr for 1 hour 72 km/hr for 3/4 hour and 26 km/hr for 15 minutes. find its average speed for the whole journey​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

A car travels 84 km/ h for 1 hour 72 km/h for 3/4 hour and 26 km/h for 15 minutes, its average speed for the whole journey​ is $72.25km/h$

Step-by-step explanation:

• The average speed is defined as the total distance divided by the time taken to travel this distance

       average speed =total distance/total time

      distance= speed *time

From the question, the car first moves from point A to another point B

1) the speed of the car from A to B is $V_{1}=84km/h$

time to reach the point B is $t_{1}=1hr$

the distance from point A to B is

$d_{1}=V_{1} t_{1}=84*1=84km$

2) then the car moves to point C

speed of the car over here is $V_{2}=72km/h$

time taken to cover the distance B to C $t_{2}=3/4hr=0.75hr$

distance from B to C $d_{2} =V_{2} t_{2}=72*3/4=54km$

now the car travels from point C to D

the speed of the car $V_{3}=26km/h$

3) and time taken is $t_{3}=15mnt=15/60hr=0.25hr$

and the final distance covered $d_{3} =0.25*26=6.5km$

thus average speed is the total distance divided by the total time

$V=\frac{d_{1} +d_{2} +d_{3} }{t_{1} +t_{2} +t_{3} }$

$V=144.5/2=72.25km/h$